I first saw the Magnetic Ten Frame Boards when our school's Math Coach brought them into my classroom when she was teaching addition & subtraction to my kindergarten students! I thought they were so helpful to the students that I decided to order them for myself and one of the other K teachers. It gives a way for the students to record their thinking and you can check their work, yet it is not permanent, since they are easily cleared off and the student can continue to solve other problems. Another strategy besides their fingers! It is great that the counters are two sided with red & yellow, so you can check to see if the students understand each number partner or addend!